The Shinhan Bank Proleague 08–09 is a team league where 12 teams compete in 5 Rounds in the round-robin format. At the end of regular season, the top six teams will compete in a play-off round to determine the winner of the team league.

Rounds 1, 2, 4 and 5, each team submits their lineup for sets 1 to 4 prior to their match. Match-ups for a set are revealed minutes before the set is played. If the game reaches the 5th set, a player is chosen to represent the team in the Ace Game. This player can be anyone, including those that have already played. The best player of the team would usually be sent out to win the match for the team.

Round 3 is played in the Winners League format, also known as the All-Kill Format. Each team submits their first player for set 1 prior to their match. Unlike the previous format, when a player wins their set, they continue to play on the next set until they are either knocked out or the team achieves 4 wins.

After the end of Round 3, a Winners League Playoff will be held for the four highest scoring teams in Rounds 3 and 4. The play off consists of 3 matches. The 3rd and 4th placed teams will first play each other. The winner of the match will continue to play against the 2nd placed team. Finally, the winner of the match will play the 1st placed team to determine the Winners League champion.

The Post-Season Play-Off is held after all 5 Rounds have been played. The top 6 placing teams in the league will enter the play-off brackets where seeding is determined based on their position in the league.